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Cumulative Impact of Wind Turbines on Landscape & Visual Amenity Guidance

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Cumulative Impact of Wind Turbines on Landscape & Visual Amenity Guidance Pembrokeshire and Carmarthenshire: Cumulative Impact of Wind Turbines on Landscape and Visual Amenity guidance Final Report for Carmarthenshire County Council Pembrokeshire Coast National Park Authority Pembrokeshire County Council April 2013 Tel: 029 2043 7841 Email: [email protected] Web: www.whiteconsultants.co.uk Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire CONTENTS 1. Introduction and scope of guidance .................................................. 4 2. Assessing cumulative impacts- issues and objectives ............................. 8 3. Assessing cumulative landscape impacts .......................................... 13 4. Assessing cumulative impacts on visual amenity ................................. 18 5. Relationship between Onshore and Offshore developments ................... 20 6. Cumulative effects with other types of development ........................... 22 7. Step by step guide .................................................................... 24 8. Tools .................................................................................... 26 9. Cumulative Landscape and Visual Impact Assessment Checklist ............... 29 10. Planning context and background.................................................. 32 TABLES Table 1 Landscape type in relation to wind turbine development Table 2 Potential sensitive receptors Table 3 Recommended cumulative assessment search and study areas Table 4 Information requirements for turbine size ranges FIGURES Figure 1 Outline of process Figure 2 Turbine types and size comparison - small to medium sized turbines Figure 3 Turbine types and size comparison - medium large sized turbines Figure 4 Landscape types with regard to wind turbine development Figure 5 Flow chart of the process Figure 6 Diagrammatic Scoping and Study areas PHOTOS AND SKETCHES Photos 1-4 illustrating issues Sketches 1-4 illustrating issues APPENDICES Appendix A Planning context and background Appendix B Useful references Appendix C Glossary White Consultants 1 Final /260413 Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire Abbreviations used in text CLVIA Cumulative Landscape and Visual Impact Assessment EIA Environmental impact assessment GLVIA Guidelines for landscape and visual impact assessment GIS Geographic information system km Kilometres LVIA Landscape and visual impact assessment m metres ZTV Zone of Theoretical Visibility Cover photos: Left- turbine in National Park-Richard James, Pembrokeshire Coast National Park Authority. Middle- turbines near Herbrandston, Pembrokeshire. Right- Alltwalis windfarm, Carmarthenshire. White Consultants 2 Final /260413 Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire A INTRODUCTION ISSUES OBJECTIVES CONTEXT White Consultants 3 Final /260413 Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire 1. Introduction and scope of guidance 1.1. This document sets out the agreed approach across three local planning authorities to assessing the cumulative impact of onshore wind turbines on landscape and visual amenity in Pembrokeshire and Carmarthenshire. The guidance1 is intended to be used for development management purposes by developers, consultants and planning officers. 1.2. The document focuses on cumulative impact issues and should be read in conjunction with other national and local policies (see 1.17 and Appendix A) and guidance on landscape, seascape and visual impact assessment (LVIA). 1.3. It is structured so that the background context and objectives are set out in Part A (Sections 1-6) and Appendix A- Section 10 and the step by step guide, tools and checklists set out in Part B (Sections 7-9). Environmental Impact Assessment requirements in relation to cumulative effects 1.4. Cumulative impact assessment is set within the framework of Environmental Impact Assessment (EIA). This is an evidence-based procedure which sets out the likely significant effects of a proposed development on the environment so they can be taken into account in the planning process. The Town and Country Planning (Environmental Impact Assessment) (England and Wales) Regulations 20112, consolidate previous regulations and set out the current requirements for meeting European Directive 85/337/EEC. 1.5. EIA may be required for development falling under Schedule 2 of the Regulations. The threshold for wind turbine developments is more than 2 turbines or where the hub height of any turbine or any other structure exceeds 15 metres (Regulation 2(1)). 1.6. Below this threshold, EIA is not mandatory but the Local Planning Authorities will provide a ‘screening opinion’ if requested based on whether the development may give rise to significant environmental effects. Schedule 3 selection criteria for screening Schedule 2 developments states that: ‘The characteristics of development must be considered having regard, in particular, to- a) the size of development b) the cumulation with other development ......’ 1.7. If a proposed development requires an Environmental Impact Assessment, then Schedule 4, Part 1 of the EIA Regulations states that: ‘a description of the likely significant effects of the Development on the 1 Supplementary planning guidance in Carmarthenshire and Pembrokeshire Coast National Park and practice guidance in Pembrokeshire 2 SI No. 1824 White Consultants 4 Final /260413 Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire environment, which should cover the direct effects and any indirect, secondary, cumulative, short, medium and long term, permanent and temporary, positive and negative effects of the development.....’(4) 1.8. Circular 02/99, which provides guidance on the Regulations, states: ‘in judging.... the effects of a development....local planning authorities should always have regard to the possible cumulative effects with any existing or approved development’ (paragraph 46). Definition of cumulative impact 1.9. For the purposes of this guidance the following definition of cumulative impacts, first used by Scottish Natural Heritage (SNH)3 , applies: ‘the additional changes caused by a proposed development in conjunction with other similar developments or as the combined effect of a set of developments, taken together.’ (paragraph 7) 1.10. An assessment of both combined and additional effects will be required from the developer where a cumulative landscape and visual impact assessment (CLVIA) is considered necessary. The reason for this is that the Local Planning Authorities consider that the landscapes and seascapes of Pembrokeshire and Carmarthenshire have a range of thresholds of acceptable change for wind energy development beyond which further development would be inappropriate in landscape and visual terms. The developer is therefore required to provide sufficient information to enable the Local Planning Authorities to decide if this threshold has been reached in a given area. 1.11. Factors that contribute to the cumulative impact of wind turbine development on landscape and visual amenity include: The distance between individual wind turbine developments The distance and area over which they are intervisible The overall character of landscape and its sensitivity to wind turbine development The siting and design of wind turbines and wind farms themselves The way in which landscape is experienced. When will a cumulative assessment will be needed? 1.12. Cumulative scoping assessments should be carried out where the proposed wind turbine development may be seen in conjunction with other wind turbine developments. These developments will include existing, under construction and consented wind turbines and those ‘in planning’ i.e. at planning application stage. 1.13. Detailed cumulative impact assessments are only required where it is considered that the proposal could result in significant cumulative impact which could affect the eventual planning decision. The scale and complexity of assessments should be proportionate to the impacts 3 'Assessing the Cumulative Impact of Onshore Wind Energy Developments', Scottish Natural Heritage, March 2012 White Consultants 5 Final /260413 Guidance on cumulative impact of wind turbines on landscape and visual amenity: Pembrokeshire and Carmarthenshire (Scottish Natural Heritage cumulative guidance2 paragraph 56). 1.14. These requirements are summarised in Figure 1 and set out in more detail in Figure 5. Figure 1 Outline of process 1.15. Whilst the threshold for requiring EIA is turbines above 15m high to hub (as defined in 1.5) this does not mean that cumulative effects involving turbines at or below 15m to hub will not occur. In respect of this size of turbine, cumulative effects will need to be addressed in documents supporting the planning application taking note of the principles and objectives in this SPG. They should also be taken into account where they are located in the search or study area in a CLVIA for a larger wind turbine development. In both cases, the level of detail should be proportionate. More detail of what information would be required can be found in Table 4. Functional objectives of the guidance 1.16. The guidelines are intended to: Set out the emerging cumulative impact issues in Pembrokeshire and Carmarthenshire (Section 2). Set out clear objectives to accommodate onshore
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